CVE-2021-31402: Dio Dio Vulnerable To CRLF Injection Vulnerability

HIGH
Advisory Identifier: GHSA-9324-jv53-9cc8
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CVSS 7.5
CWE-93
Published
Advisory Summary

CVE-2021-31402 is a HIGH (CVSS 7.5) dio vulnerable to crlf injection vulnerability (CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')) affecting Dio libraries in the Pub ecosystem. The issue involves dio vulnerable to crlf injection with http method string. Remediation is available by upgrading affected packages to version 5.0.0.

CVE-2021-31402 at a Glance

CVE Identifier CVE-2021-31402
GHSA Identifier GHSA-9324-jv53-9cc8
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')
Affected Product Dio
Package Ecosystem Pub
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2021-31402

To remediate this vulnerability, upgrade all affected Dio dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

dio fixed: 5.0.0 
Upgrade dio to 5.0.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for dio

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-31402, inspect your project dependencies for Dio:

inspect dependencies for dio

Analyze the terminal output to locate any version of Dio in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.0.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection'), where the product uses crlf (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes crlf sequences from inputs. In Dio, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact The dio package 4.0.0 for Dart allows CRLF injection if the attacker controls the HTTP method string, a different vulnerability than CVE-2020-35669. ### Patches The vulnerability has been resolved by https://github.com/cfug/dio/commit/927f79e93ba39f3c3a12c190624a55653d577984, and included since v5.0.0. ### Workarounds Cherry-pick the commit to your own fork can resolves the vulberability too. ### References - https://nvd.nist.gov/vuln/detail/CVE-2021-31402 - https://osv.dev/GHSA-jwpw-q68h-r678 - https://github.com/cfug/dio/issues/1130 - https://github.com/cfug/dio/issues/1752

CVE-2021-31402 Affected Dio Versions

1 component(s)
Fixed Versions:
5.0.0
Product / Package Ecosystem Affected Versions Fixed Version
dio
 Pub
< 5.0.0
5.0.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/cfug/dio/security/advisories/GHSA-9324-jv53-9cc8
NVD — CVE-2021-31402 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-31402
Dio Source Repository REPOSITORY
https://github.com/cfug/dio/issues/1752
Dio Source Repository REPOSITORY
https://github.com/flutterchina/dio/issues/1130
Security Fix Commit FIX COMMIT
https://github.com/cfug/dio/commit/927f79e93ba39f3c3a12c190624a55653d577984
Dio Source Repository REPOSITORY
https://github.com/cfug/dio
osv.dev/ghsa-jwpw-q68h-r678 WEB
https://osv.dev/GHSA-jwpw-q68h-r678
Dio Security Information SECURITY
https://security.snyk.io/vuln/SNYK-PUB-DIO-5891148

Frequently Asked Questions

What is CVE-2021-31402?
CVE-2021-31402 is a security vulnerability in Dio involving dio vulnerable to CRLF injection with HTTP method string under CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection').
Which Dio versions are affected?
Affected versions include releases prior to 5.0.0 across affected packages: dio.
What version fixes CVE-2021-31402?
Upgrading to 5.0.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is dio affected?
Yes, dio is affected in releases prior to 5.0.0. Upgrade your dependency to 5.0.0 or later.
What is the CVSS score of CVE-2021-31402?
CVE-2021-31402 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2021-31402?
CVE-2021-31402 is classified under CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection') (The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.).
How can I check Pub dependencies for CVE-2021-31402?
Run the dependency tree command: 'inspect dependencies for dio'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-9324-jv53-9cc8",
  "modified" : "2023-03-21T22:41:11Z",
  "published" : "2023-03-21T22:41:11Z",
  "aliases" : [ "CVE-2021-31402" ],
  "summary" : "dio vulnerable to CRLF injection with HTTP method string",
  "details" : "### Impact\nThe dio package 4.0.0 for Dart allows CRLF injection if the attacker controls the HTTP method string, a different vulnerability than CVE-2020-35669.\n\n### Patches\nThe vulnerability has been resolved by https://github.com/cfug/dio/commit/927f79e93ba39f3c3a12c190624a55653d577984, and included since v5.0.0.\n\n### Workarounds\nCherry-pick the commit to your own fork can resolves the vulberability too.\n\n### References\n- https://nvd.nist.gov/vuln/detail/CVE-2021-31402\n- https://osv.dev/GHSA-jwpw-q68h-r678\n- https://github.com/cfug/dio/issues/1130\n- https://github.com/cfug/dio/issues/1752\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Pub",
      "name" : "dio"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.0.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/cfug/dio/security/advisories/GHSA-9324-jv53-9cc8"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-31402"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cfug/dio/issues/1752"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/flutterchina/dio/issues/1130"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cfug/dio/commit/927f79e93ba39f3c3a12c190624a55653d577984"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/cfug/dio"
  }, {
    "type" : "WEB",
    "url" : "https://osv.dev/GHSA-jwpw-q68h-r678"
  }, {
    "type" : "WEB",
    "url" : "https://security.snyk.io/vuln/SNYK-PUB-DIO-5891148"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-93" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-03-21T22:41:11Z",
    "nvd_published_at" : null
  }
}